问题
选择题
All passengers ____, please fasten your seat belts and remain seated ____the plane is landing．
A．on board; until
B．abroad; since
C．on the board; before
D．aboard; when
答案
答案：D
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All passengers ____, please fasten your seat belts and remain seated ____the plane is landing．
A．on board; until
B．abroad; since
C．on the board; before
D．aboard; when
答案：D